JSONObject中optString和getString等的区别

    The difference is that 

optString

 returns the empty string (

""

) if the key you specify doesn't exist.

getString

 on the other hand throws a 

JSONException

. Use 

getString

 if
it's an error for the data to be missing, or 

optString

 if you're not sure if it will be there.

    简单来说就是optString会在得不到你想要的值时候返回空字符串”“，而getString会抛出异常。至此，疑惑已经解除。